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-rw-r--r--libc/unistd/sysconf.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libc/unistd/sysconf.c b/libc/unistd/sysconf.c
index c049dc98d..66486ae9e 100644
--- a/libc/unistd/sysconf.c
+++ b/libc/unistd/sysconf.c
@@ -19,6 +19,7 @@
#define _XOPEN_SOURCE 500
#include <features.h>
+#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <grp.h>